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8 results on '"Bi, X. Z."'

1. The Lobster Eye Imager for Astronomy Onboard the SATech-01 Satellite

Author

Ling, Z. X., Sun, X. J., Zhang, C., Sun, S. L., Jin, G., Zhang, S. N., Zhang, X. F., Chang, J. B., Chen, F. S., Chen, Y. F., Cheng, Z. W., Fu, W., Han, Y. X., Li, H., Li, J. F., Li, Y., Li, Z. D., Liu, P. R., Lv, Y. H., Ma, X. H., Tang, Y. J., Wang, C. B., Xie, R. J., Xue, Y. L., Yan, A. L., Zhang, Q., Bao, C. Y., Cai, H. B., Cheng, H. Q., Cui, C. Z., Dai, Y. F., Fan, D. W., Hu, H. B., Hu, J. W., Huang, M. H., Jia, Z. Q., Jin, C. C., Li, D. Y., Li, J. Q., Liu, H. Y., Liu, M. J., Liu, Y., Pan, H. W., Qiu, Y. L., Sugizaki, M., Sun, H., Wang, W. X., Wang, Y. L., Wu, Q. Y., Xu, X. P., Xu, Y. F., Yang, H. N., Yang, X., Zhang, B., Zhang, M., Zhang, W. D., Zhang, Z., Zhao, D. H., Cong, X. Q., Jiang, B. W., Li, L. H., Qiu, X. B., Sun, J. N., Su, D. T., Wang, J., Wu, C., Xu, Z., Yang, X. M., Zhang, S. K., Zhang, N., Zhu, Y. F., Ban, H. Y., Bi, X. Z., Cai, Z. M., Chen, W., Chen, X., Chen, Y. H., Cui, Y., Duan, X. L., Feng, Z. G, Gao, Y., He, J. W., He, T., Huang, J. J., Li, F., Li, J. S., Li, T. J., Li, T. T., Liu, H. Q., Liu, L., Liu, R., Liu, S., Meng, N., Shi, Q., Sun, A. T., Wang, Y. M., Wang, Y. B., Wu, H. C., Xu, D. X, Yang, Y. Q, Yang, Y., Yu, X. S., Zhang, K. X., Zhang, Y. L., Zhang, Y. H., Zhang, Y. T., Zhou, H., Zhu, X. C., Cheng, J. S., Qin, L., Wang, L., Wang, Q. L., Bai, M., Gao, R. L., Ji, Z., Liu, Y. R., Ma, F. L., Shi, Y. J., Su, J., Tan, Y. Y., Tong, J. Z., Xu, H. T., Xue, C. B., Xue, G. F., and Yuan, W.

Subjects
Astrophysics - Instrumentation and Methods for Astrophysics, High Energy Physics - Experiment, Physics - Instrumentation and Detectors
Abstract

The Lobster Eye Imager for Astronomy (LEIA), a pathfinder of the Wide-field X-ray Telescope of the Einstein Probe (EP) mission, was successfully launched onboard the SATech-01 satellite of the Chinese Academy of Sciences on 27 July 2022. In this paper, we introduce the design and on-ground test results of the LEIA instrument. Using state-of-the-art Micro-Pore Optics (MPO), a wide field-of-view (FoV) of 346 square degrees (18.6 degrees * 18.6 degrees) of the X-ray imager is realized. An optical assembly composed of 36 MPO chips is used to focus incident X-ray photons, and four large-format complementary metal-oxide semiconductor (CMOS) sensors, each of 6 cm * 6 cm, are used as the focal plane detectors. The instrument has an angular resolution of 4 - 8 arcmin (in FWHM) for the central focal spot of the point spread function, and an effective area of 2 - 3 cm2 at 1 keV in essentially all the directions within the field of view. The detection passband is 0.5 - 4 keV in the soft X-rays and the sensitivity is 2 - 3 * 10-11 erg s-1 cm-2 (about 1 mini-Crab) at 1,000 second observation. The total weight of LEIA is 56 kg and the power is 85 W. The satellite, with a design lifetime of 2 years, operates in a Sun-synchronous orbit of 500 km with an orbital period of 95 minutes. LEIA is paving the way for future missions by verifying in flight the technologies of both novel focusing imaging optics and CMOS sensors for X-ray observation, and by optimizing the working setups of the instrumental parameters. In addition, LEIA is able to carry out scientific observations to find new transients and to monitor known sources in the soft X-ray band, albeit limited useful observing time available., Comment: Accepted by RAA

Published
2023
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2. First wide field-of-view X-ray observations by a lobster eye focusing telescope in orbit

Author

Zhang, C., Ling, Z. X., Sun, X. J., Sun, S. L., Liu, Y., Li, Z. D., Xue, Y. L., Chen, Y. F., Dai, Y. F., Jia, Z. Q., Liu, H. Y., Zhang, X. F., Zhang, Y. H., Zhang, S. N., Chen, F. S., Cheng, Z. W., Fu, W., Han, Y. X., Li, H., Li, J. F., Li, Y., Liu, P. R., Ma, X. H., Tang, Y. J., Wang, C. B., Xie, R. J., Yan, A. L., Zhang, Q., Jiang, B. W., Jin, G., Li, L. H., Qiu, X. B., Su, D. T., Sun, J. N., Xu, Z., Zhang, S. K., Zhang, Z., Zhang, N., Bi, X. Z., Cai, Z. M., He, J. W., Liu, H. Q., Zhu, X. C., Cheng, H. Q., Cui, C. Z., Fan, D. W., Hu, H. B., Huang, M. H., Jin, C. C., Li, D. Y., Pan, H. W., Wang, W. X., Xu, Y. F., Yang, X., Zhang, B., Zhang, M., Zhang, W. D., Zhao, D. H., Bai, M., Ji, Z., Liu, Y. R., Ma, F. L., Su, J., Tong, J. Z., Wang, Y. S., Zhao, Z. J., Feldman, C., O'Brien, P., Osborne, J. P., Willingale, R., Burwitz, V., Hartner, G., Langmeier, A., Müller, T., Rukdee, S., Schmidt, T., Kuulkers, E., and Yuan, W.

Subjects
Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Instrumentation and Methods for Astrophysics
Abstract

As a novel X-ray focusing technology, lobster eye micro-pore optics (MPO) feature both a wide observing field of view and true imaging capability, promising sky monitoring with significantly improved sensitivity and spatial resolution in soft X-rays. Since first proposed by Angel (1979), the optics have been extensively studied, developed and trialed over the past decades. In this Letter, we report on the first-light results from a flight experiment of the Lobster Eye Imager for Astronomy ($LEIA$), a pathfinder of the wide-field X-ray telescope of the Einstein Probe mission. The piggyback imager, launched in July 2022, has a mostly un-vignetted field of view of $18.6^\circ \times 18.6^\circ $. Its spatial resolution is in the range of 4$-$7 arcmin in FWHM and the focal spot effective area is 2$-$3 cm$^2$, both showing only mild fluctuations across the field of view. We present images of the Galactic center region, Sco X-1 and the diffuse Cygnus Loop nebular taken in snapshot observations over 0.5$-$4 keV. These are truly wide-field X-ray images of celestial bodies observed, for the first time, by a focusing imaging telescope. Initial analyses of the in-flight data show excellent agreement between the observed images and the on-ground calibration and simulations. The instrument and its characterization are briefly described, as well as the flight experiment. The results provide a solid basis for the development of the present and proposed wide-field X-ray missions using lobster eye MPO., Comment: 11 pages, 4 figures. Accepted for publication in Astrophysical Journal Letter

Published
2022
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3. First Wide Field-of-view X-Ray Observations by a Lobster-eye Focusing Telescope in Orbit

Author

Zhang, C., primary, Ling, Z. X., additional, Sun, X. J., additional, Sun, S. L., additional, Liu, Y., additional, Li, Z. D., additional, Xue, Y. L., additional, Chen, Y. F., additional, Dai, Y. F., additional, Jia, Z. Q., additional, Liu, H. Y., additional, Zhang, X. F., additional, Zhang, Y. H., additional, Zhang, S. N., additional, Chen, F. S., additional, Cheng, Z. W., additional, Fu, W., additional, Han, Y. X., additional, Li, H., additional, Li, J. F., additional, Li, Y., additional, Liu, P. R., additional, Ma, X. H., additional, Tang, Y. J., additional, Wang, C. B., additional, Xie, R. J., additional, Yan, A. L., additional, Zhang, Q., additional, Jiang, B. W., additional, Jin, G., additional, Li, L. H., additional, Qiu, X. B., additional, Su, D. T., additional, Sun, J. N., additional, Xu, Z., additional, Zhang, S. K., additional, Zhang, Z., additional, Zhang, N., additional, Bi, X. Z., additional, Cai, Z. M., additional, He, J. W., additional, Liu, H. Q., additional, Zhu, X. C., additional, Cheng, H. Q., additional, Cui, C. Z., additional, Fan, D. W., additional, Hu, H. B., additional, Huang, M. H., additional, Jin, C. C., additional, Li, D. Y., additional, Pan, H. W., additional, Wang, W. X., additional, Xu, Y. F., additional, Yang, X., additional, Zhang, B., additional, Zhang, M., additional, Zhang, W. D., additional, Zhao, D. H., additional, Bai, M., additional, Ji, Z., additional, Liu, Y. R., additional, Ma, F. L., additional, Su, J., additional, Tong, J. Z., additional, Wang, Y. S., additional, Zhao, Z. J., additional, Feldman, C., additional, O’Brien, P., additional, Osborne, J. P., additional, Willingale, R., additional, Burwitz, V., additional, Hartner, G., additional, Langmeier, A., additional, Müller, T., additional, Rukdee, S., additional, Schmidt, T., additional, Kuulkers, E., additional, and Yuan, W., additional

Published
2022
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5. Physical localization of phyA and rbcS genes in rice

Author

Bi, X. Z., Ren, N., Liu, L. H., Cheng, K. C., and Song, Y. C.

Subjects
Genes, Photoperiod, Genetic markers, Genetic mapping, Phytochrome, Gene expression, Chromosomes
Abstract

This article 'Physical localization of phyA and rbcS genes in rice' appeared in the International Rice Research Notes series, created by the International Rice Research Institute (IRRI) to expedite communication among scientists concerned with the development of improved technology for rice and rice-based systems. The series is a mechanism to help scientists keep each other informed of current rice research findings. The concise scientific notes are meant to encourage rice scientists to communicate with one another to obtain details on the research reported.

Published
1998
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7. The physical Location of Genes cdc2 and prh1 in Maize (Zea Mays L.)

Author

Ren, N., Song, Y. C., Bi, X. Z., Ding, Y., and Liu, L. H.

Abstract

A biotin-labelling in situ hybridization technique was first used to physically map two single copy genes, cdc2 and prh1, in maize. These two genes are metabolically interrelated genes. The full-length cDNA clones cdc2ZmA and ZmPPI of genes cdc2 and prh1 were adopted as the probes. They are 1.3 and 1.6 kb in size, respectively. Clone cdc2ZmA was physically mapped on the long arm of chromosomes 4, 8, and 9. The percent distances from centromere to detection site were 57.9 ± 2.7, 28.4 ± 1.5, and 88.2 ± 3.3. The detection rate was 19.2 %. Clone ZmPPI was physically mapped on the long arm of chromosomes 4, 6, and 8. The percent distances were 53.6 ± 1.2, 60.8 ± 2.9 and 17.1 ± 1.6. The detection ratio was 18.5 %. The technique of chromosome ISH and the relationship between the location and function of these two genes have been discussed.

Published
1997
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8. [Effect of suture canalization on the treatment of primary open-angle glaucoma: 3 years clinical observation].

Author

Pan WH, Bi XZ, Yu XP, and Song ZM

Subjects
Analysis of Variance, Case-Control Studies, Glaucoma, Open-Angle drug therapy, Humans, Intraocular Pressure, Phacoemulsification, Postoperative Period, Retrospective Studies, Sclera surgery, Time Factors, Tonometry, Ocular, Visual Acuity, Glaucoma, Open-Angle surgery, Suture Techniques, Trabeculectomy
Abstract

Objective: To evaluate the safety and effectiveness of the Suture Canalization, which is a kind of Schlemm canal surgery, on the treatment of patients with primary open angle glaucoma (POAG)., Methods: Retrospective cases series study. Fifty-two patients (52 eyes) with POAG were recruited from October 2007 to July 2009 from Hospital of Optometry and Ophthalmology, Wenzhou Medical University. Twenty-six patients (26 eyes) were included in the study group, who were treated with the Suture Canalization surgery with trabeculectomy. Twenty-six patients (26 eyes) were included as the control group, who were treated with trabeculectomy only. Best correct visual acuity (BCVA), intraocular pressure (IOP), bleb morphology, postoperative treatment of medicine of anti-glaucoma and complications of surgery were recorded at 1 d, 1 week, 1, 3, 6, 12, 18, 24, 30 and 36 months after surgery. After testing the normality and homogeneity of variance of the data of the multiple sets of measurement data, the variance analysis was adopted, and the t test was used in the comparison of two groups. Counting data using chi-square test, the level of variables between the groups should be compared with the rank sum test., Results: No significant difference was found in baseline data, as well as the changes of BCVA between the study group and control group at the last visit (χ(2)=3.06, P=0.08) . Complete and qualified success was achieved in 18 (69.2%) and 23 (88.5%) cases separately in study group, 16 (61.5%) and 22 (84.6%) cases separately in control group (χ(2)=0.17, P=0.69) . There was no significant difference between two groups. IOP was decreased post-operatively: from (32.4±9.3) mmHg(1 mmHg=0.133 kPa)to (16.9±3.5) mmHg at the last visit in study group and (31.3±10.0) mmHg to (15.5±4.6) mmHg at the last visit in control group. There were significant difference between last visit and preoperative IOP between two groups (study group: t=8.12, P<0.01; control group: t=7.20, P<0.01). No significant difference was found between two groups in the decreased amplitude of IOP with treatment at the last visit (t=0.23, P=0.63), as well as the postoperative IOP at the different visits (P>0.05). 65.4% of cases in the study group and 61.5% patients in control group formed functional blebs (diffuse type and microcapsule type) at the last visit. No significant difference between the IOP of patients with functional blebs (15.5±3.5) mmHg and those with non-functional blebs (16.0±3.4) mmHg in study group at the last visit (t=-0.49, P=0.64). No serious complications during and after surgery were found in subjects of the both groups. No significant difference was present in medicine amounts at last visit between the two groups (t=2.93, P=0.09)., Conclusions: Suture Canalization is a safe and effective surgical procedure to decrease intraocular pressure in patients with POAG, through Schlemm canal and external filtration. While it maybe not suitable to the patient with high pre-operative IOP.(Chin J OPhthalmol, 2016, 52: 416-421).

Published
2016
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